Lighting system for cinematographs.



R. STRAUBEL.

LIGHTING SYSTEM FOR CINEMATOGRAPHS. APPLICATION FILED MAY 22' 1914.

1,143,663; Patented June 22, 1915.

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UNITED STATES PATENT OFFICE. T

nUDoL'F STRAUIBEL, OF JENA, GERMANY, AssIGNom-To THE FIRM or CARL ZEISS,or

mun, GERMANY.

LIGHTING SYSTEM FOR CINEMATOGRAPHS. i l

To all} whom it may concern Be it known that I, RUDOLF STRAUBEL,a-citizen of the German Empire, residing -at. Jena, Germany, haveinvented a new and useful Lighting System for Cinematographs, of whichthe following is a specification.

The invention forms a development of those lighting systems forcinematographs, in which. a condenser purpose of forming an image of asource of light approximately at v lective lens, while the saidcollective lens serves for forming an image of the exit pupil of thecondenser system in the plane of the film, and in which an auxiliarycondenser system lying near the film plane serves for forming an imageof the said image of the source of light in the entrance pupil of aprojection system. When one or. more cooling chambers are introducedinto such a system, with the usual construction of cooling chamber thenumber of refleeting surfaces in and the loss of light therebyincreased. Ac-. cording to the invention this increase in the number ofreflecting surfaces may be restricted or entirely avoided, by letting atleast two of the water-bounded chamber-surfaces belong to the lensesforming the lighting system. Such an arrangement results in differentconstructional forms according to the number and disposition of thecooling'chambers in the lighting system. In the simplest case a coolingchamber will be given-such dimensions as to fill the space between .twolensesof the lighting system and to be thus bounded on both sides'bylenses. The cooling chamber may be further enlarged and be composed oftwo chambers, each of which maybe bounded either on both sides by a lensor only on one side by a lens and on the other bya pl arched) plate. Ineach of the three cases, that are possible with such an arrangement, onelens of the lighting system comes to lie within the entire coolingchamber.

In the annexed drawing four construc tional examples of the inventionare shown, each by a longitudinal section. In each case the samelighting system is taken as a basis, (1 a being a two-part condensersys- Specification of Letters Patent.

system serves the the locus of a col-' the system is added to ane (or anPatented June 22', 1915.

Application filed May'22, 1914. Serial No. 840,361.

an auxiliary ing chamber e is lenses, namely by and the collectiveexample (Fig. 2) and e correspondrst example (Figure 1) shows a 4 mg toFig. 1 are united, so that the 001- lective lens 6 comes. to lie withinthe entire cooling chamber. Fig; 3 shows the combination of a coolingchamber e which corresponds to Fig. 1,, with a coolingchamber c which isbounded .on one side by the collective lens 6- and arched plate f, thecollective lens I) again lies within the entire cooling chamber. 'Fig. 4shows the combination of two cooling chambers e and 6 each of which isbounded on one of its sides by the collective lens 6 and on the otherside by an arched plate f; the collective lens 6 again lies within theentire cooling chamber.

claim:

on the other side by an In a lighting system for cinematographs,

tioned on the opposite side of the said collective lens to the saidcondenser system, the said collective lens being adapted to form animage of the exit pupil of the said condenser system in the neighborhoodof the said auxiliary condenser system, and at least one cooling chamberfitted between the two condenser systems, -at least two of thewater-bounded chamber-surfaces being surfaces of lenses of the lightingsystem.

RUDOLF STRAUB EL.

. Witnesses:

' PAUL KRfieER, FRrrz SANDER.

